Solar Thermal Power Generation
Continuous generation via molten salt storage
Unique Storage Advantage: Solar thermal power generation uses molten salt to store solar heat, enabling continuous electricity production day and night or during cloudy periods, offering greater stability than photovoltaic or wind power.
Critical Role of Potassium Nitrate: High-purity potassium nitrate is an essential component of the molten salt thermal storage fluid, requiring very low impurity levels (especially chloride ions <40 ppm) to prevent corrosion and ensure system longevity.
| Project | Indicator | ||||
| IClass | Ⅱ Class | ⅢClass | |||
| IType | Ⅱ Type | ||||
| Potassium Nitrate (KNO₃) (on a dry basis) w/% ≥ | 99.8 | 99.6 | 99.4 | 98.5 | |
| Water Content w / % ≤ | 0.10 | 0.10 | 0.15 | 0.10 | |
| Water-insoluble Matter w/% ≤ | 0.01 | 0.01 | 0.03 | 0.02 | |
| Chloride (as Cl) w/% ≤ | 0.01 | 0.02 | 0.02 | 0.02 | |
| Sulfate (in SO₄) w/% ≤ | 0.005 | 0.005 | 0.01 | 0.01 | |
| Carbonate (as CO₃) w/% ≤ | 0.01 | 0.01 | 0.01 | 0.45 | |
| Ammonium Salt (measured in NH₄) w% ≤ | 0.02 | 0.07 | 一 | 一 | |
| Moisture Absorption Rate w/% ≤ | 一 | 0.20 | 0.25 | 一 | |
| Looseness (through a 4.75mm test sieve) w/% ≥ | 一 | 一 | 一 | 95 | |
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Solar thermal power generation refers to a technology that converts the thermal energy of sunlight into thermal energy carried by a heat transfer fluid, which is subsequently transferred to a power generation system for electricity production. This technology utilizes molten salt to store solar thermal energy during the day and release it on cloudy days or at night when sunlight is unavailable, thereby enabling continuous power generation. Compared with photovoltaic power generation and wind power generation, solar thermal power generation is not only more environmentally friendly but also offers greater stability. It can be directly connected to the power grid, making it one of the most promising renewable and green energy sources currently available.
In solar thermal power generation systems, the molten salt used for thermal energy storage is an essential component. Molten salt typically consists primarily of potassium nitrate or a mixture where potassium nitrate is the main constituent. Due to its corrosive nature and specific melting point requirements, the quality of potassium nitrate used in molten salt formulations is subject to stringent technical specifications. In addition to requiring high purity, the concentration of impurity ions must be kept extremely low, particularly chloride ions (Cl⁻), which are the primary contributors to equipment corrosion and reduced service life.
The high-purity potassium nitrate produced by our company contains over 99.9% potassium nitrate, with chloride ion (Cl⁻) content below 40 ppm, carbonate content below 40 ppm, and sulfate content below 30 ppm. These specifications make it an ideal choice for use in solar thermal power generation applications.
